US6515393B2 - Automotive alternator - Google Patents

Automotive alternator Download PDF

Info

Publication number
US6515393B2
US6515393B2 US09/839,396 US83939601A US6515393B2 US 6515393 B2 US6515393 B2 US 6515393B2 US 83939601 A US83939601 A US 83939601A US 6515393 B2 US6515393 B2 US 6515393B2
Authority
US
United States
Prior art keywords
winding
slots
portions
phase
conductor wire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US09/839,396
Other languages
English (en)
Other versions
US20020063490A1 (en
Inventor
Yoshihito Asao
Atsushi Oohashi
Katsumi Adachi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=18829587&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US6515393(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Assigned to MITSUBISHI DENKI KABUSHIKI KAISHA reassignment MITSUBISHI DENKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ADACHI, KATSUMI, ASAO, YOSHIHITO, OOHASHI, ATSUSHI
Publication of US20020063490A1 publication Critical patent/US20020063490A1/en
Application granted granted Critical
Publication of US6515393B2 publication Critical patent/US6515393B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings

Definitions

  • the present invention relates to an automotive alternator and particularly to a stator winding construction for an automotive alternator.
  • an automotive alternator includes: a stator constructed by installing a stator winding into a cylindrical stator core in which slots extending axially are formed at a predetermined pitch in a circumferential direction; and a rotor disposed on an inner circumferential side of the stator and having a field winding.
  • the slots are disposed in the stator core at a ratio of one per phase per pole, in proportion to the number of phases in the stator winding and the number of magnetic poles in the rotor.
  • the slots are disposed at a ratio of one per phase per pole in this manner, the amount of time that a tooth formed between the slots overlaps an adjacent pair of the magnetic poles.relative to a radial direction is long, leading to increased magnetic flux leakage.
  • This magnetic flux leakage reduces effective magnetic flux and gives rise to surges in the magnetic flux, resulting in fluctuations in the generated voltage and disturbing the output waveform, which causes ripples when the alternating current is converted into direct current.
  • FIG. 20 is a schematic diagram in which part of a stator such as that described in Japanese Patent Laid-Open No. HEI 4-26345, for example, is developed into a plan.
  • a stator core 60 is composed by forming a magnetic steel plate into a cylindrical shape, slots 61 extending axially being disposed therein at an even angular pitch in a circumferential direction at a ratio of two per phase per pole.
  • slots 61 are disposed in the stator core 60 so as to obtain a stator winding 63 composed of first and second three-phase alternating-current windings.
  • the seventy-two slots 61 are constructed by arranging at a pitch of six slots slot group composed of first to sixth slots 61 a , 61 a ′, G 1 b , 61 b ′, 61 c , and 61 c ′ disposed at a pitch corresponding to an electrical angle of 30° from each other.
  • a first single-phase winding portion 63 a is constructed by winding a conductor wire into a wave shape in a first slot group composed of the first slots 61 a
  • a third single-phase winding portion 63 b is constructed by winding a conductor wire into a wave shape in a third slot group composed of the third slots 61 b
  • a fifth single-phase winding portion 63 c is constructed by winding a conductor wire into a wave shape in a fifth slot group composed of the fifth slots 61 c .
  • the first three-phase alternating-current winding is constructed by forming the first, third, and fifth single-phase winding portions 63 a , 63 b , and 63 c wound in this manner into a Y-connection.
  • the slots into which the first, third, and fifth single-phase winding portions 63 a , 63 b , and 63 c are wound have a phase difference corresponding to an electrical angle of 60° from each other.
  • a second single-phase winding portion 63 a ′ is constructed by winding a conductor wire into a wave shape in a second slot group composed of the second slots 61 a ′
  • a fourth single-phase winding portion 63 b ′ is constructed by winding a conductor wire into a wave shape in a fourth slot group composed of the fourth slots 61 b ′
  • a sixth single-phase winding portion 63 c ′ is constructed by winding a conductor wire into a wave shape in a sixth slot group composed of the sixth slots 61 c ′.
  • the second three-phase alternating-current winding is constructed by forming the second, fourth, and sixth single-phase winding portions 63 a ′, 63 b ′, and 63 c ′ wound in this manner into a Y-connection.
  • the slots into which the second, fourth, and sixth single-phase winding portions 63 a ′, 63 b ′, and 63 c ′ are wound have a phase difference corresponding to an electrical angle of 60° from each other.
  • the second, fourth, and sixth single-phase winding portions 63 a ′, 63 b ′, and 63 c ′ have a phase difference corresponding to an electrical angle of 30° from the first, third, and fifth single-phase winding portions 63 a , 63 b , and 63 c , respectively.
  • a stator 65 is prepared by winding these single-phase winding portions 63 a , 63 a ′, 63 b , 63 b ′, 63 c , and 63 c ′ in the stator core 60 .
  • the slots 61 are disposed at a ratio of two per phase per pole, portions of a tooth 62 overlapping an adjacent pair of the magnetic poles relative to the radial direction is dramatically reduced.
  • magnetic flux leakage is reduced, enabling reductions in effective magnetic flux to be suppressed.
  • the generation of surges in the magnetic flux is suppressed, reducing fluctuations in the generated voltage and disturbances to the output waveform, thereby reducing ripples when the alternating current is converted into direct current.
  • the single-phase winding portions 63 a , 63 a ′, 63 b , 63 b ′, 63 c , and 63 c ′ constituting the stator winding 63 are each constructed by winding the conductor wire into a wave shape in every sixth slot 61 so as to extend out of a first slot 61 and enter a second slot 61 six slots away.
  • bundles containing a predetermined number of the conductor wires constituting the single-phase winding portions 63 a , 63 a ′, 63 b , 63 b ′, 63 c , and 63 c ′ overlap radially in regions A where the conductor wires are bent circumferentially after extending outwards from the slots 61 , expanding radially.
  • coil end groups of the stator winding 63 are formed with large irregularities relative to the circumferential direction, and one problem has been that loud wind noise is generated as a result of pressure differences between the coil end groups and the rotor and between the coil end groups and fans. Furthermore, the radially-overlapping bundles of the conductor wires in the regions A where the conductor wires are bent circumferentially after extending outwards from the slots 61 are less likely to be exposed to a cooling airflow, and therefore another problem has been that heat generated in the stator 65 does not efficiently dissipate from the coil end groups, making it difficult to suppress temperature increases in the stator 65 , and output cannot be improved.
  • the present invention aims to solve the above problems and an object of the present invention is to provide an automotive alternator enabling temperature increases in a stator to be suppressed by constructing a single-phase winding portion constituting a stator winding by installing a conductor wire which extends from slots such that winds thereof are divided onto first and second circumferential sides, reducing circumferential irregularities in a coil end group to reduce wind noise, and suppressing radial overlap between bundles of winds of the conductor wire constituting the coil end group to raise heat dissipation from the coil end group.
  • an automotive alternator including:
  • stator provided with a cylindrical stator core in which a plurality of slots extending axially are formed circumferentially and a stator winding installed in the stator core, the stator being supported in the bracket so as to surround an outer circumference of the rotor,
  • the slots are formed in the stator core at a ratio of two per phase per pole
  • stator winding is provided with two three-phase alternating-current windings, each of the three-phase alternating-current windings being constructed by forming three single-phase winding portions installed in the slots into an alternating-current connection, and
  • each of the single-phase winding portions is constructed by installing a conductor wire such that winds of the conductor wire extend outwards from first and second ends of the slots, are divided onto first and second circumferential sides, and enter slots on the first and second circumferential sides.
  • At least one of the single-phase winding portions may be provided with a plurality of wave windings formed by winding the conductor wire for a predetermined number of winds into a wave-shaped pattern composed of slot-housed portions disposed at a pitch of six slots in a circumferential direction and crossover portions linking together end portions of adjacent pairs of the slot-housed portions alternately relative to an axial direction,
  • the plurality of wave windings being offset by six slots from each other in a circumferential direction and installed in the slots such that the crossover portions face each other axially.
  • At least one of the single-phase winding portions may be provided with a divided wave winding, the divided wave winding including:
  • a first winding sub-portion formed by winding the conductor wire for a predetermined number of winds into a first wave-shaped pattern composed of first slot-housed portions disposed at a pitch of six slots in a circumferential direction and first crossover portions linking together end portions of adjacent pairs of the first slot-housed portions alternately relative to an axial direction;
  • a second winding sub-portion formed by continuing to wind the conductor wire from a winding finish end of the first winding sub-portion for a predetermined number of winds into a second wave-shaped pattern composed of second slot-housed portions disposed at a pitch of six slots in a circumferential direction and second crossover portions linking together end portions of adjacent pairs of the second slot-housed portions alternately relative to an axial direction,
  • first winding sub-portion and the second winding sub-portion are stacked such that the first slot-housed portions and the second slot-housed portions face each other, and the first crossover portions and the second crossover portions face each other axially.
  • a neutral-point lead wire of at least one of the single-phase winding portions may be led out of a first slot and an output wire thereof may be led out of a second slot.
  • At least one of the three-phase alternating-current windings may be constructed by forming the three single-phase winding portions into a Y-connection, slots out of which neutral-point lead wires of the three single-phase winding portions are led being disposed between a circumferentially-adjacent pair of slots out of which output wires of the single-phase winding portions are led.
  • At least one of the single-phase winding portions may be constructed by installing the conductor wire in a lap winding in the slots.
  • At least one of the single-phase winding portions may be provided with a winding sub-portion constructed by simultaneously winding a plurality of strands of the conductor wire.
  • At least one of the single-phase winding portions may be constructed by connecting in series winding sub-portions constructed by winding the conductor wire.
  • the number of divided winds of the conductor wire extending outwards from the first and second ends of the slots and divided onto the first and second circumferential sides may be the same in at least one of the single-phase winding portions.
  • At least one of the single-phase winding portions may be provided with a plurality of winding sub-portions formed by installing at least one strand of the conductor wire in the stator core, the number of divided winds of the conductor wire extending outwards from the first and second ends of the slots and divided onto the first and second circumferential sides being different in each of the plurality of winding sub-portions, and the total number of divided winds of the conductor wire extending outwards from the first and second ends of the slots and divided onto the first and second circumferential sides being the same on the first and second circumferential sides.
  • Coil end groups of the stator winding may be constituted by a plurality of crossover portions linking together slot-housed portions of the conductor wire housed in pairs of the slots six slots apart outside end surfaces of the stator core, at least some crossover portions of the plurality of crossover portions being axially offset.
  • Coil end groups of the stator winding may be constituted by a plurality of crossover portions linking together slot-housed portions of the conductor wire housed in pairs of the slots six slots apart outside end surfaces of the stator core, the crossover portions constituting an inner circumferential side of the coil end groups being constructed such that the winds of the conductor wire therein line up axially without overlapping radially.
  • a fan may be mounted to an axial end surface of the rotor
  • coil end groups of the stator winding may be constituted by a plurality of crossover portions linking together slot-housed portions of the conductor wire housed in pairs of the slots six slots apart outside end surfaces of the stator core,
  • a fan may be mounted to an axial end surface of the rotor
  • coil end groups of the stator winding may be constituted by a plurality of crossover portions linking together slot-housed portions of the conductor wire housed in pairs of the slots six slots apart outside end surfaces of the stator core,
  • a ventilation gap is formed between base portions of the crossover portions and end surfaces of the stator.
  • a central portion of an axial height of the fan and an apex portion of the coil end group may be generally aligned relative to the axial direction.
  • FIG. 1 is a cross section showing an automotive alternator according to Embodiment 1 of the present invention.
  • FIG. 2 is a perspective showing a stator used in the automotive alternator according to Embodiment 1 of the present invention
  • FIG. 3 is a perspective showing a single-phase winding portion constituting a stator winding of the stator in the automotive alternator according to Embodiment 1 of the present invention
  • FIG. 4 is an exploded perspective showing the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 1 of the present invention
  • FIG. 5 is a diagram explaining a process for forming the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 1 of the present invention
  • FIG. 6 is another diagram explaining the process for forming the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 1 of the present invention
  • FIG. 7 is a circuit diagram showing an electric power supply circuit in the automotive alternator according to Embodiment 1 of the present invention.
  • FIG. 8 is a schematic diagram in which a part of the stator in the automotive alternator according to Embodiment 1 of the present invention is developed into a plan;
  • FIG. 9 is a perspective showing a single-phase winding portion constituting a stator winding of a stator in an automotive alternator according to Embodiment 2 of the present invention.
  • FIG. 10 is a diagram explaining a process for forming the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 2 of the present invention.
  • FIG. 11 is a perspective showing a single-phase winding portion constituting a stator winding of a stator in an automotive alternator according to Embodiment 4 of the present invention.
  • FIG. 12A is a diagram explaining a process for forming the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 4 of the present invention.
  • FIG. 12B is another diagram explaining the process for forming the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 4 of the present invention.
  • FIG. 12C is yet another diagram explaining the process for forming the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 4 of the present invention.
  • FIG. 13A is a diagram explaining a process for forming a single-phase winding portion constituting a stator winding of a stator in an automotive alternator according to Embodiment 5 of the present invention
  • FIG. 13B is another diagram explaining the process for forming the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 5 of the present invention.
  • FIG. 13C is yet another diagram explaining the process for forming the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 5 of the present invention.
  • FIG. 14 is a perspective showing a stator in an automotive alternator according to Embodiment 6 of the present invention.
  • FIG. 15 is a partial perspective explaining a stator winding construction of a stator in an automotive alternator according to Embodiment 7 of the present invention.
  • FIG. 16 is a cross section taken along line XVI—XVI in FIG. 15 viewed from the direction of the arrows;
  • FIG. 17 is a diagram explaining a process for forming a single-phase winding portion constituting a stator winding of a stator in an automotive alternator according to Embodiment 8 of the present invention.
  • FIG. 18 is another diagram explaining the process for forming the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 8 of the present invention.
  • FIG. 19 is a perspective showing the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 8 of the present invention.
  • FIG. 20 is a schematic diagram in which a part of a stator in a conventional automotive alternator is developed into a plan
  • FIG. 21 is a perspective showing the stator in the conventional automotive alternator.
  • FIG. 22 is another schematic diagram in which a part of the stator in the conventional automotive alternator is developed into a plan.
  • FIG. 1 is a cross section showing an automotive alternator according to Embodiment 1 of the present invention
  • FIG. 2 is a perspective showing a stator used in the automotive alternator according to Embodiment 1 of the present invention
  • FIG. 3 is a perspective showing a single-phase winding portion constituting a stator winding of the stator in the automotive alternator according to Embodiment 1 of the present invention
  • FIG. 4 is an exploded perspective showing the single-phase winding portion constituting the stator winding of the stator in the automotive alternator according to Embodiment 1 of the present invention
  • FIGS. 5 and 6 are diagrams explaining a process for forming the single-phase winding portion
  • FIG. 7 is a circuit diagram showing an electric power supply circuit in the automotive alternator according to Embodiment 1 of the present invention.
  • a neutral-point lead wire and an output wire are omitted from FIG. 2 .
  • the automotive alternator includes: a case 3 constituted by an aluminum front bracket 1 and an aluminum rear bracket 2 ; a shaft 6 disposed inside the case 3 having a pulley 4 secured to a first end thereof; a Lundell-type rotor 7 secured to the shaft 6 ; fans 5 secured to first and second axial end surfaces of the rotor 7 ; a stator 8 secured to the case 3 so as to envelop the rotor 7 ; slip rings 9 secured to a second end of the shaft 6 for supplying electric current to the rotor 7 ; a pair of brushes 10 sliding on surfaces of the slip rings 9 ; a brush holder 11 accommodating the brushes 10 ; rectifiers 12 electrically connected to the stator 8 for converting alternating current generated in the stator 8 into direct current; and a regulator 18 fitted onto the brush holder 11 for adjusting the magnitude of the alternating voltage generated in the stator 8 .
  • the rotor 7 is constituted by a field winding 13 for generating magnetic flux on passage of an electric current, and a pair of first and second pole cores 20 and 21 disposed so as to cover the field winding 13 , magnetic poles being formed in the first and second pole cores 20 and 21 by magnetic flux generated in the field winding 13 .
  • the pair of first and second pole cores 20 and 21 are made of iron, each has a plurality of first and second claw-shaped magnetic poles 22 and 23 having a generally trapezoidal outermost diameter surface shape disposed on an outer circumferential edge portion at even angular pitch in a circumferential direction so as to project axially, and the first and second pole cores 20 and 21 are fixed to the shaft 6 facing each other such that the first and second claw-shaped magnetic poles 22 and 23 intermesh.
  • the stator 8 is constituted by: a cylindrical stator core formed by laminating a magnetic steel plate; and a stator winding 16 installed in the stator core 15 .
  • the stator 8 is held between the front bracket 1 and the rear bracket 2 so as to form a uniform air gap between outer circumferential surfaces of the claw-shaped magnetic poles 22 and 23 and an inner circumferential surface of the stator core 15 .
  • stator 8 Next, a construction of the stator 8 will be explained with reference to FIGS. 2 to 6 .
  • Slots 15 a extending axially are disposed in the stator core 15 at an even angular pitch in a circumferential direction at a ratio of two per phase per pole.
  • seventy-two slots 15 a from a Slot Number 1 to a Slot Number 72 are disposed in the stator core 15 so as to obtain the stator winding 16 , which is composed of first and second three-phase alternating-current windings.
  • a copper wire material having a circular cross section coated with an electrically-insulating layer is used in a conductor wire 32 .
  • a single-phase winding portion 30 is constituted by type-A and type-B wave windings 31 A and 31 B.
  • these type-A and type-B wave windings 31 A and 31 B are constructed by winding the conductor wire 32 for a predetermined number of winds into a wave-shaped pattern composed of twelve wave-winding slot-housed portions 31 a disposed at a pitch of six slots (6P) in a circumferential direction and wave-winding crossover portions 31 b linking together end portions of adjacent pairs of the wave-winding slot-housed portions 31 a alternately relative to an axial direction.
  • 6P six slots
  • the single-phase winding portion 30 is constructed by offsetting the type-A and type-B wave windings 31 A and 31 B by six slots in a circumferential direction and stacking them. As shown in FIG. 3, in this single-phase winding portion 30 , the wave-winding slot-housed portions 31 a of the type-A and type-B wave windings 31 A and 31 B are stacked on top of each other in a radial direction, and the wave-winding crossover portions 31 b are disposed so as to face each other axially.
  • the single-phase winding portion 30 is installed in the stator core 15 such that two wave-winding slot-housed portions 3 la are housed in every sixth slot 15 a , that is, in each slot 15 a in a first slot group constituted by Slot Numbers 1 , 7 , 13 , . . . , and 67 .
  • winding start ends 32 a of the type-A and type-B wave windings 31 A and 31 B extend outwards from a first slot 15 a
  • winding finish ends 32 b extend outwards from a second slot 15 a six slots away.
  • the single-phase winding portion 30 in which the type-A and type-B wave windings 31 A and 31 B are connected in parallel, is prepared by joining together the winding start ends 32 a and joining together the winding finish ends 32 b .
  • the joined winding start ends 32 a constitute a neutralpoint lead wire of the single-phase winding portion 30
  • the joined winding finish ends 32 b constitute an output wire of the single-phase winding portion 30 .
  • an annular winding unit 33 is prepared by winding one strand of the conductor wire 32 for a predetermined number of winds, and type-A and type-B star winding units 34 A and 34 B are each prepared by forming the winding unit 33 into a star shape in which end portions of adjacent pairs of the star-winding slot-housed portions 34 a are alternately linked on an inner circumferential side and an outer circumferential side by star-winding crossover portions 34 b .
  • FIG. 5 an annular winding unit 33 is prepared by winding one strand of the conductor wire 32 for a predetermined number of winds
  • type-A and type-B star winding units 34 A and 34 B are each prepared by forming the winding unit 33 into a star shape in which end portions of adjacent pairs of the star-winding slot-housed portions 34 a are alternately linked on an inner circumferential side and an outer circumferential side by star-winding crossover portions 34 b .
  • the type-A and type-B star winding units 34 A and 34 B are offset and stacked on top of each other such that the star-winding slot-housed portions 34 a overlap and the star-winding crossover portions 34 b face each other radially. Then, the inner circumferential side of the stacked type-A and type-B star winding units 34 A and 34 B is pushed inside the stator core 15 from a first end surface of the stator core 15 .
  • the star-winding crossover portions 34 b on the inner circumferential side of the type-A and type-B star winding units 34 A and 34 B are extended outwards at a second end surface of the stator core 15 , and the star-winding slot-housed portions 34 a are pushed into each of the slots 15 a , installing the single-phase winding portion 30 in the stator core 15 .
  • a single-phase winding portion 30 is similarly installed in each of: a second slot group constituted by Slot Numbers 2 , 8 , 14 , . . . , and 68 ; a third slot group constituted by Slot Numbers 3 , 9 , 15 , . . . , and 69 ; a fourth slot group constituted by Slot Numbers 4 , 10 , 16 , . . . , and 70 ; a fifth slot group constituted by Slot Numbers 5 , 11 , 17 , . . . , and 71 ; and a sixth slot group constituted by Slot Numbers 6 , 12 , 18 , . . . , and 72 .
  • the stator 8 is obtained, which is composed of the six single-phase winding portions 30 installed in the stator core 15 as shown in FIG. 2 .
  • the wave-winding crossover portions 31 b of the six single-phase winding portions 30 are disposed outside the first and second end surfaces of the stator core 15 , constituting front-end and rear-end coil end groups 16 f and 16 r of the stator winding 16 .
  • Base portions of the wave-winding crossover portions 31 b constituting the coil end groups 16 f and 16 r are separated by a predetermined distance from the end surfaces of the stator core 15 and disposed generally parallel to the end surfaces of the stator core 15 , forming ventilation gaps between the base portions of the wave-winding crossover portions 31 b and the end surfaces of the stator core 15 .
  • axial heights of the wave-winding crossover portions 31 b positioned on an inner circumferential side and an outer circumferential side of the coil end groups 16 f and 16 r are low, the axial height of the wave-winding crossover portions 31 b increasing towards a radially-intermediate portion of the coil end groups 16 f and 16 r .
  • the first and second axial end surfaces (the fan mounting surfaces) of the rotor 7 are positioned axially further outwards than the base portions of the wave-winding crossover portions 31 b of the coil end groups 16 f and 16 r in the stator 8 constructed in this manner.
  • the fans 5 overlap the wave-winding crossover portions 31 b of the coil end groups 16 f and 16 r relative to an axial direction, and ventilation gaps 51 are formed between base portions 50 of the wave-winding crossover portions 31 b and the end surfaces of the stator core 15 .
  • central portions M of axial heights of the fans 5 are generally aligned with apex portions of the coil end groups 16 f and 16 r relative to the axial direction.
  • a first three-phase alternating-current winding 160 is constructed by connecting neutral points (Y-connection) of the three single-phase winding portions 30 installed in the first, third, and fifth slot groups
  • a second three-phase alternating-current winding 160 is constructed by connecting neutral points (Y-connection) of the three single-phase winding portions 30 installed in the second, fourth, and sixth slot groups.
  • the winding finish ends 32 b (output wires) of the single-phase winding portions 30 constituting each of the three-phase alternating-current windings 160 are connected to the rectifiers 12 , constructing the electrical circuit shown in FIG. 7 .
  • the three single-phase winding portions 30 installed in the first, third, and fifth slot groups are each given a phase difference corresponding to an electrical angle of 60°
  • the three single-phase winding portions 30 installed in the second, fourth, and sixth slot groups are each given a phase difference corresponding to an electrical angle of 60°
  • the three single-phase winding portions 30 installed in the second, fourth, and sixth slot groups are given a phase difference corresponding to an electrical angle of 30° relative to the three single-phase winding portions 30 installed in the first, third, and fifth slot groups, respectively.
  • an electric current is supplied from a battery (not shown) through the brushes 10 and the slip rings 9 to the field winding 13 , generating a magnetic flux.
  • the first claw-shaped magnetic poles 22 on the first pole core 20 are magnetized into North-seeking (N) poles by this magnetic flux, and the second claw-shaped magnetic poles 23 on the second pole core 21 are magnetized into South-seeking (S) poles.
  • the pulley 4 is driven by the engine and the rotor 7 is rotated by the shaft 6 .
  • a rotating magnetic field is applied to the stator core 15 due to the rotation of the rotor 7 , generating an electromotive force in the three-phase alternating-current windings 160 of the stator winding 16 .
  • the alternating electromotive force generated in each of the three-phase alternating-current windings 160 is converted into direct current by each of the rectifiers 12 and the magnitude of the output voltage thereof is adjusted by the regulator 18 . Then, the output from each of the rectifiers is combined, recharging the battery.
  • front-end and rear-end air intake apertures 1 a and 2 a are disposed through axial end surfaces of the front bracket 1 and the rear bracket 2
  • front-end and rear-end air discharge apertures 1 b and 2 b are disposed through radial side surfaces of the front bracket 1 and the rear bracket 2 so as to face the coil end groups 16 f and 16 r of the stator winding 16 .
  • the fans 5 are rotated and driven together with the rotation of the rotor 7 , and a cooling airflow channel is formed in which external air is sucked inside the case 3 through the front-end and rear-end air intake apertures 1 a and 2 a , flows axially towards the rotor 7 , is then deflected centrifugally by the fans 5 , thereafter crosses the coil end groups 16 f and 16 r , and is discharged outside through the front-end and rear-end air discharge apertures 1 b and 2 b .
  • heat generated in the stator 8 is dissipated from the coil end groups 16 f and 16 r to the cooling airflow, suppressing temperature increases in the stator 8 .
  • the single-phase winding portions 30 are each constructed by installing the conductor wire 32 so as to extend outwards from first and second ends of the slots 15 a , be divided in first and second circumferential directions A 1 and A 2 , and enter each of the slots 15 a six slots away on the first and second circumferential directions A 1 and A 2 .
  • a predetermined number of winds of the conductor wire 32 extending outwards from the slots 15 a are divided onto the first and second circumferential sides as shown in FIG.
  • the thickness of the conductor wire is approximately 0.7 times that of cases where a single-phase winding portion 30 achieving similar output voltage is composed of one wave winding.
  • the number of turns required in the single-phase winding portion constructed by connecting the type-A and type-B wave windings 31 A and 31 B in parallel is the same as the number of turns required in the single-phase winding portion composed of one wave winding. Consequently, the number of turns in each wave winding is the same.
  • the total cross-sectional area is designed to approach the cross-sectional area of the slots.
  • the thickness of the conductor wire in these single-phase winding portions 30 is approximately 0.7 times that of cases where a single-phase winding portion 30 achieving similar output voltage is composed of one wave winding for a similar amount of generated heat.
  • the conductor wire 32 is less likely to rub against edge portions of openings of the slots and damage electrically-insulating layers, thereby improving electrical insulation.
  • winding start ends 32 a neutral-point lead wires of the type-A and type-B wave windings 31 A and 31 B constituting each of the single-phase winding portions 30 extend out from a common slot and the winding finish ends 32 b (output wires) extend out from a common slot, the winding start ends 32 a and the winding finish ends 32 b can be connected without being led around, facilitating the connection operation.
  • the number of winds of the conductor wire 32 is the same in the type-A and type-B wave windings 31 A and 31 B constituting each of the single-phase winding portions 30 , the number of winds of the conductor wire led out from the first and second ends of the slots 15 a and divided onto the first and second circumferential directions A 1 and A 2 is the same, forming the coil end groups 16 f and 16 r in a well-balanced manner.
  • the wave-winding crossover portions 31 b constituting the coil end groups 16 f and 16 r are axially offset, radial overlap between the wave-winding crossover portions 31 b is reduced, enabling radial dimensions of the coil end groups 16 f and 16 r to be reduced.
  • distances between the brackets 1 and 2 and the coil end groups 16 f and 16 r are increased, ensuring electrical insulation.
  • electrical insulation distance between the brackets 1 and 2 and the coil end groups 16 f and 16 r is ensured.
  • first and second axial end surfaces (the fan mounting surfaces) of the rotor 7 are positioned axially further outwards than the base portions of the wave-winding crossover portions 31 b of the coil end groups 16 f and 16 r , coil end root portions, which are major sources of wind noise, do not overlap with the fans 5 , and harmonic components in the wind noise having the same degrees as the number of slots are suppressed, reducing wind noise.
  • the cooling airflow flows through the ventilation gaps between the wave-winding crossover portions 31 b and the end surfaces of the stator core 15 , efficiently cooling the coil end groups 16 f and 16 r and suppressing temperature increases in the stator 8 .
  • the central portions M of the axial heights of the fans 5 are generally aligned with the apex portions of the coil end groups 16 f and 16 r relative to the axial direction, the fan central portions, where wind speed is greatest, and the apex portions, which have the largest ventilated surface area on the coil end groups 16 f and 16 r , overlap, efficiently cooling the coil end groups 16 f and 16 r and further suppressing temperature increases in the stator 8 .
  • the single-phase winding portions 30 are each constructed by connecting type-A and type-B wave windings 31 A and 31 B in parallel, the type-A and type-B wave windings 31 A and 31 B being composed of type-A and type-B star winding units 34 A and 34 B each formed by winding one strand of conductor wire 32 for a predetermined number of winds, but in Embodiment 2, the single-phase winding portions 30 A are each constructed by connecting first and second type-A wave windings 31 A in parallel, the first and second type-A wave windings 31 A being composed of type-A star winding units 34 A each formed by winding one strand of conductor wire 32 for a predetermined number of winds.
  • the first and second type-A wave windings 31 A are disposed such that the wave-winding slot-housed portions 31 a of the first and second type-A wave windings 31 A are stacked on top of each other in a radial direction and the wave-winding crossover portions 31 b face each other axially.
  • the winding start end 32 a of the first type-A wave winding 31 A and the winding finish end 32 b of the second type-A wave winding 31 A extend outwards from a slot 15 a positioned in the center of three slots 15 a lined up at a pitch of six slots.
  • the winding finish end 32 b of the first type-A wave winding 31 A and the winding start end 32 a of the second type-A wave winding 31 A each extend outwards from slots 15 a positioned at first and second ends of the three slots 15 a lined up at a pitch of six slots.
  • the single-phase winding portion 30 A in which the first and second type-A wave windings 31 A are connected in parallel, is prepared by joining the winding start end 32 a and the winding finish end 32 b which extend outwards from the slot 15 a positioned in the center, and joining the winding start end 32 a and the winding finish end 32 b which extend outwards from each of the slots positioned at the first and second ends.
  • the joint portion between the winding start end 32 a and the winding finish end 32 b which extend outwards from the slot 15 a positioned in the center and the joint portion between the winding start end 32 a and the winding finish end 32 b which extend outwards from each of the slots positioned at the first and second ends constitute a neutral-point lead wire and an output wire, respectively, of the single-phase winding portion 30 A.
  • the rest of the construction is constructed in a similar manner to Embodiment 1 above.
  • the single-phase winding portion 30 A is prepared by offsetting and stacking first and second type-A star winding units 34 A on top of each other such that the star-winding slot-housed portions 34 a overlap and the star-winding crossover portions 34 b face each other radially, and installing the type-A star winding units 34 A in the stator core 15 .
  • the single-phase winding portion 30 A in which the first and second type-A star winding units 34 A are connected in parallel, is constructed by connecting the winding finish end 32 b of the first type-A star winding unit 34 A and the winding start end 32 a of the second type-A star winding unit 34 A extending outwards from the slot 15 a positioned in the center of the three slots 15 a lined up at a pitch of six slots, and connecting the winding start end 32 a and the winding finish end 32 b of the first and second type-A star winding units 34 A extending outwards from each of the slots positioned at the first and second ends of the three slots 15 a lined up at a pitch of six slots.
  • Embodiment 2 Similar effects to those in Embodiment 1 above can also be achieved in Embodiment 2. Furthermore, because it is not necessary to prepare two types of star winding unit, the manufacturing process is simplified, and divided winding portions can be constructed without increasing the number of types of winding unit.
  • type-A star winding units 34 A are used, but type-B star winding units 34 B may be used in place of type-A star winding units 34 A.
  • the single-phase winding portion 30 A is constructed by connecting the first and second type-A wave windings 31 A (type-A star winding units 34 A) in parallel, but in Embodiment 3, a single-phase winding portion is constructed by connecting the first and second type-A wave windings 31 A (type-A star winding units 34 A) in series.
  • the first and second type-A wave windings 31 A are disposed in a similar manner to Embodiment 2 above.
  • the first and second type-A wave windings 31 A are disposed such that the wave-winding slot-housed portions 31 a of the first and second type-A wave windings 31 A are stacked on top of each other in a radial direction and the wave-winding crossover portions 31 b face each other axially.
  • the single-phase winding portion in which the first and second type-A wave windings 31 A are connected in series, is prepared by connecting the winding start end 32 a and the winding finish end 32 b of the first and second type-A wave windings 31 A extending outwards from the slot 15 a positioned in the center of the three slots 15 a lined up at a pitch of six slots.
  • the winding start end 32 a and the winding finish end 32 b of the first and second type-A wave windings 31 A extending outwards from each of the slots positioned at the first and second ends of the three slots 15 a lined up at a pitch of six slots constitute a neutral-point lead wire and an output wire, respectively, of the single-phase winding portion.
  • the single-phase winding portion is constituted by connecting in series the first and second type-A star winding units 34 A, the number of winds of the conductor wire in the star winding units is halved compared to cases in which a single-phase winding portion having the same number of turns is constituted by one star winding unit, facilitating preparation of the star winding units and improving mountability into the slots.
  • the single-phase winding portion is constructed by connecting in series the first and second type-A wave windings 31 A, which are each composed of one strand of conductor wire wound for a predetermined number of winds, but in Embodiment 4, a single-phase winding portion 30 B having the same number of turns as the above single-phase winding portion is constituted by one divided wave winding 35 composed of one strand of conductor wire wound for a predetermined number of winds.
  • the single-phase winding portion 30 B is prepared using the divided wave winding 35 , which is composed of a first winding sub-portion 36 formed by winding the conductor wire 32 for a predetermined number of winds into a first wave-shaped pattern composed of first wave-winding slot-housed portions 36 a disposed at a pitch of six slots in a circumferential direction and first wave-winding crossover portions 36 b linking together end portions of adjacent pairs of the first wave-winding slot-housed portions 36 a alternately relative to an axial direction, and a second winding sub-portion 37 formed by continuing to wind the conductor wire 32 from a winding finish end of the first winding sub-portion 36 for a predetermined number of winds into a second wave-shaped pattern composed of second wave-winding slot-housed portions 37 a disposed at a pitch of six slots in a circumferential direction and second wave-winding crossover portions 37 b linking together end portions of adjacent pairs of the second wave-winding
  • the winding start end 32 a of the divided wave winding 35 constitutes a neutral-point lead wire of the single-phase winding portion 30 B
  • the winding finish end 32 b constitutes an output wire of the single-phase winding portion 30 B.
  • the rest of the construction is constructed in a similar manner to Embodiment 3 above.
  • a first annular winding unit 38 a is prepared by winding one strand of the conductor wire 32 for a predetermined number of winds
  • a second annular winding unit 38 b is prepared by continuing to wind the strand of the conductor wire 32 for a predetermined number of winds.
  • type-A and type-B star winding units 39 A and 39 B composed of one strand of the conductor wire 32 are prepared by forming the first and second annular winding units 38 a and 38 b into star shapes in which adjacent pairs of the star-winding slot-housed portions 39 a are alternately linked on an inner circumferential side and an outer circumferential side by star-winding crossover portions 39 b .
  • the type-A and type-B star winding units 39 A and 39 B are folded over at a portion of the conductor wire 32 linking the type-A and type-B star winding units 39 A and 39 B and are stacked on top of each other such that the star-winding slot-housed portions 39 a overlap and the star-winding crossover portions 39 b face each other radially.
  • the inner circumferential side of the stacked type-A and type-B star winding units 39 A and 39 B is pushed inside the stator core 15 from a first end surface of the stator core 15 , the star-winding crossover portions 39 b on the inner circumferential side of the type-A and type-B star winding units 39 A and 39 B are extended outwards at a second end surface of the stator core 15 , and the star-winding slot-housed portions 39 a are pushed into each of the slots 15 a , installing the single-phase winding portion 30 B in the stator core 15 .
  • Embodiment 4 Similar effects to those in Embodiment 3 above can also be achieved in Embodiment 4, and because the single-phase winding portion 30 B, which has the same number of turns as the single-phase winding portion according to Embodiment 3, is constituted by one divided wave winding 35 formed by winding one strand of the conductor wire 32 , the total number of neutral-point lead wires and output wires from the single-phase winding portion 30 B is two, improving connection workability compared to Embodiment 3 above.
  • the total number of divided winds of the conductor wire 32 led out from each of the slots 15 a and divided onto the first and second circumferential sides is the same at the first and second ends of the slots 15 a irrespective of how the two divided wave windings 35 are wound, and the coil end groups 16 f and 16 r are formed in a well-balanced manner.
  • the two divided wave windings 35 be installed such that the total number of divided winds of the conductor wire 32 led out from each of the slots 15 a and divided onto the first and second circumferential sides is the same at the first and second ends of the slots 15 a .
  • the two divided wave windings 35 should be wound such that the first wave-winding crossover portions 36 b having three winds radially face the second wave-winding crossover portions 37 b having four winds.
  • the total number of divided winds of the conductor wire 32 led out from each of the slots 15 a and divided onto the first and second circumferential sides is seven at the first and second ends of the slots 15 a , and the coil end groups 16 f and 16 r are formed in a well-balanced manner.
  • the coil end groups 16 f and 16 r can be formed in a well-balanced manner even if the single-phase winding portion is constructed with an odd number of turns.
  • the single-phase winding portion 30 B is constituted by one divided wave winding 35 formed by winding one strand of the conductor wire 32 for a predetermined number of winds, but in Embodiment 5, a single-phase winding portion is constituted by one divided wave winding 41 formed by simultaneously winding two strands of the conductor wire 32 for a predetermined number of winds. Moreover, the rest of the construction is constructed in a similar manner to Embodiment 4 above.
  • a first annular winding unit 40 a is prepared by simultaneously winding two strands of the conductor wire 32 for a predetermined number of winds, and a second annular winding unit 40 b is prepared by continuing to wind the two strands of the conductor wire 32 for a predetermined number of winds.
  • a first annular winding unit 40 a is prepared by simultaneously winding two strands of the conductor wire 32 for a predetermined number of winds
  • a second annular winding unit 40 b is prepared by continuing to wind the two strands of the conductor wire 32 for a predetermined number of winds.
  • type-A and type-B star winding units 41 A and 41 B composed of two strands of the conductor wire 32 are prepared by forming the first and second annular winding units 40 a and 40 b into star shapes in which adjacent pairs of the star-winding slot-housed portions 41 a are alternately linked on an inner circumferential side and an outer circumferential side by star-winding crossover portions 41 b .
  • FIG. 13B type-A and type-B star winding units 41 A and 41 B composed of two strands of the conductor wire 32 are prepared by forming the first and second annular winding units 40 a and 40 b into star shapes in which adjacent pairs of the star-winding slot-housed portions 41 a are alternately linked on an inner circumferential side and an outer circumferential side by star-winding crossover portions 41 b .
  • the type-A and type-B star winding units 41 A and 41 B are folded over at a portion of the conductor wires 32 linking the type-A and type-B star winding units 41 A and 41 B and are stacked on top of each other such that the star-winding slot-housed portions 41 a overlap and the star-winding crossover portions 41 b face each other radially.
  • the inner circumferential side of the stacked type-A and type-B star winding units 41 A and 41 B is pushed inside the stator core 15 from a first end surface of the stator core 15 , the star-winding crossover portions 41 b on the inner circumferential side of the type-A and type-B star winding units 41 A and 41 B are extended outwards at a second end surface of the stator core 15 , and the star-winding slot-housed portions 41 a are pushed into each of the slots 15 a , installing the single-phase winding portion, which is composed of one divided wave winding 41 prepared from two strands of the conductor wire 32 , in the stator core 15 .
  • Embodiment 5 because the divided wave winding 41 is prepared by simultaneously winding two strands of the conductor wire 32 , a single-phase winding portion equivalent to the single-phase winding portion constituted by one divided wave winding 35 according to Embodiment 4 can be constructed by connecting winding start ends 32 a and winding finish ends 32 b of the divided wave winding 41 so as to connect the two strands of the conductor wire 32 in series.
  • the number of winding steps for the conductor wire 32 in the process of forming the divided wave winding 41 is half the number of winding steps for the conductor wire 32 in the process of forming the divided wave winding 35 , shortening the formation time for a divided wave winding 41 having a predetermined number of turns.
  • a single-phase winding portion equivalent to the single-phase winding portion constituted by two divided wave windings 35 connected in parallel according to Embodiment 4 can be constructed by connecting the winding start ends 32 a and the winding finish ends 32 b of the divided wave winding 41 so as to connect the two strands of the conductor wire 32 in parallel.
  • the number of winding steps for the conductor wire 32 in the process of forming the divided wave winding 41 is the same as the number of winding steps for the conductor wire 32 in the process of forming one divided wave winding 35 , but only one divided wave winding is required, effectively shortening the formation time for the divided wave winding.
  • Embodiment 5 because the two strands of the conductor wire 32 are wound simultaneously, the winding start ends 32 a and the winding finish ends 32 b of the two strands of the conductor wire 32 are led out of the same slots, facilitating the connection process.
  • the stator winding 16 is constituted by first and second three-phase alternating-current windings 160 , constructed such that the slots 15 a from which the neutral-point lead wires of the a-phase, b-phase, and c-phase single-phase winding portions constituting the first three-phase alternating-current winding 160 are led out are positioned between the slots 15 a from which the b-phase and c-phase output wires are led out, and the slots 15 a from which the neutralpoint lead wires of the a′-phase, b′-phase, and c′-phase single-phase winding portions constituting the second three-phase alternating-current winding 160 are led out are positioned between the slots 15 a from which the a′-phase and b′-phase output wires are led out.
  • slot numbers are assigned in a clockwise direction in FIG. 14 with the slot 15 a from which the output wire of the a-phase single-phase winding portion is led out as Slot Number 1
  • the neutral-point lead wire of the a-phase single-phase winding portion is led out of Slot Number 7
  • the output wire and neutral-point lead wire of the b-phase single-phase winding portion are led out of Slot Numbers 5 and 11 , respectively
  • the output wire and neutral-point lead wire of the c-phase single-phase winding portion are led out of Slot Numbers 21 and 15 , respectively.
  • the output wire and neutral-point lead wire of the a′-phase single-phase winding portion are led out of Slot Numbers 26 and 32 , respectively, the output wire and neutral-point lead wire of the b′-phase single-phase winding portion are led out of Slot Numbers 42 and 36 , respectively, and the output wire and neutral-point lead wire of the c′-phase single-phase winding portion are led out of Slot Numbers 46 and 40 , respectively.
  • the rest of the construction is constructed in a similar manner to Embodiment 1 above.
  • the construction is such that the slots 15 a from which the neutral-point lead wires of the a-phase, b-phase, and c-phase single-phase winding portions are led out are positioned between the slots 15 a from which the b-phase and c-phase output wires are led out, and the slots 15 a from which the neutral-point lead wires of the a′-phase, b′-phase, and c′-phase single-phase winding portions are led out are positioned between the slots 15 a from which the a′-phase and b′-phase output wires are led out, but the construction may be such that the slots 15 a from which the neutral-point lead wires of the a-phase, b-phase, and c-phase single-phase winding portions are led out are positioned between the slots 15 a from which the a-phase and b-phase output wires are led out, and the slots 15 a from which the neutral-point lead wires of the a′-phase,
  • Embodiment 7 the winds of the conductor wire 32 constituting the wave-winding crossover portions 31 b positioned in an innermost circumferential layer of the coil end groups 16 f and 16 r are arranged so as to line up axially without overlapping radially, as shown in FIGS. 15 and 16. Moreover, the rest of the construction is constructed in a similar manner to Embodiment 1 above.
  • the surface area of the winds of the conductor wire 32 constituting the wave-winding crossover portions 31 b on the innermost circumferential side exposed to the cooling airflow is increased, effectively suppressing temperature increases in the stator 8 .
  • the winds of the conductor wire 32 constituting the wave-winding crossover portions 3 1 b positioned in the innermost circumferential layer of one of the coil end groups 16 f and 16 r only may be arranged so as to line up axially without overlapping radially.
  • the single-phase winding portions are constituted by wave windings, but in Embodiment 8, a single-phase winding portion 47 is constituted by a lap winding.
  • a helical winding unit 45 is prepared by simultaneously winding two strands of the conductor wire 32 into a helical shape.
  • a lap winding unit 46 shown in FIG. 18 is prepared by alternately pressing open the helical winding unit 45 at intervals of a predetermined number of winds in left and right directions in FIG. 17 on a front and rear side of the helical winding unit 45 .
  • the single-phase winding portion 47 shown in FIG. 19, is obtained by installing this lap winding unit 46 into every sixth slot from an inner circumferential side of the stator core 15 .
  • This single-phase winding portion 47 is constituted by a divided lap winding in which the conductor wire 32 is wound for a predetermined number of winds into pairs of slots 15 a six slots apart, and the winds of the conductor wire 32 led out from each of the slots 15 a are divided into the same number of winds on first and second circumferential sides.
  • Embodiment 8 because the winds of the conductor wire 32 led out from each of the slots 15 a are also divided into the same number of winds on the first and second circumferential sides in a single-phase winding portion constituted by a lap winding, radial overlap between the bundles of winds of the conductor wire constituting the single-phase winding portions in the regions where the winds of the conductor wire are bent circumferentially after extending outwards from the first and second ends of the slots 15 a is distributed circumferentially, reducing radial expansion.
  • Embodiment 8 Similar effects to those in Embodiment 1 above can also be achieved in Embodiment 8.
  • the slots 15 a are disposed at a pitch corresponding to an electrical angle of 60°, but the present invention may also be applied to cases in which the slots 15 a are arranged so as to alternately adopt electrical angles of ⁇ ° ( ⁇ ° ⁇ 30°) and (60 ⁇ )°. In that case, unpleasant harmonic noise can be reduced by setting ⁇ ° appropriately.
  • the winding units are inserted into the slots by radially stacking the slot-housed portions, but the winding units may also be inserted into the slots by circumferentially stacking the slot-housed portions.
  • the electrical circuit is constructed such that output from two three-phase alternating-current windings is rectified by individual rectifiers and then combined, but the electrical circuit is not limited to this and may be constructed such that two three-phase alternating-current windings are connected in parallel and output therefrom is rectified by one rectifier, or may be constructed such that two three-phase alternating-current windings are connected in series and output therefrom is rectified by one rectifier. In an electrical circuit constructed in this manner, output decreases slightly, but only one rectifier is required, enabling a cost reduction.
  • the present invention is constructed in the above manner and exhibits the effects described below.
  • an automotive alternator including:
  • stator provided with a cylindrical stator core in which a plurality of slots extending axially are formed circumferentially and a stator winding installed in the stator core, the stator being supported in the bracket so as to surround an outer circumference of the rotor,
  • slots are formed in the stator core at a ratio of two per phase per pole
  • stator winding is provided with two three-phase alternating-current windings, each of the three-phase alternating-current windings being constructed by forming three single-phase winding portions installed in the slots into an alternating-current connection, and
  • each of the single-phase winding portions is constructed by installing a conductor wire such that winds of the conductor wire extend outwards from first and second ends of the slots, are divided onto first and second circumferential sides, and enter slots on the first and second circumferential sides,
  • an automotive alternator is provided in which circumferential irregularities in a coil end group are reduced, enabling wind noise to be lowered, and a heat-dissipating surface area of the coil end group is increased, suppressing temperature increases in the stator, thereby enabling increased performance from the viewpoints of wind noise and output.
  • At least one of the single-phase winding portions may be provided with a plurality of wave windings formed by winding the conductor wire for a predetermined number of winds into a wave-shaped pattern composed of slot-housed portions disposed at a pitch of six slots in a circumferential direction and crossover portions linking together end portions of adjacent pairs of the slot-housed portions alternately relative to an axial direction,
  • the plurality of wave windings being offset by six slots from each other in a circumferential direction and installed in the slots such that the crossover portions face each other axially, enabling a divided winding to be easily constructed by stacking winding units on top of each other.
  • At least one of the single-phase winding portions may be provided with a divided wave winding, the divided wave winding including:
  • a first winding sub-portion formed by winding the conductor wire for a predetermined number of winds into a first wave-shaped pattern composed of first slot-housed portions disposed at a pitch of six slots in a circumferential direction and first crossover portions linking together end portions of adjacent pairs of the first slot-housed portions alternately relative to an axial direction;
  • a second winding sub-portion formed by continuing to wind the conductor wire from a winding finish end of the first winding sub-portion for a predetermined number of winds into a second wave-shaped pattern composed of second slot-housed portions disposed at a pitch of six slots in a circumferential direction and second crossover portions linking together end portions of adjacent pairs of the second slot-housed portions alternately relative to an axial direction,
  • first winding sub-portion and the second winding sub-portion are stacked such that the first slot-housed portions and the second slot-housed portions face each other, and the first crossover portions and the second crossover portions face each other axially, enabling the number of neutral-point lead wires and output wires to be reduced, facilitating the connection process.
  • a neutral-point lead wire of at least one of the single-phase winding portions may be led out of a first slot and an output wire thereof may be led out of a second slot, facilitating the connection process.
  • At least one of the three-phase alternating-current windings may be constructed by forming the three single-phase winding portions into a Y-connection, slots out of which neutral-point lead wires of the three single-phase winding portions are led being disposed between a circumferentially-adjacent pair of slots out of which output wires of the single-phase winding portions are led, facilitating the connection process.
  • At least one of the single-phase winding portions may be constructed by installing the conductor wire in a lap winding in the slots, reducing wind noise and suppressing temperature increases in the stator even in a stator formed by installing a stator winding composed of a lap winding into a stator core in which the slots are disposed at a ratio of two per phase per pole.
  • At least one of the single-phase winding portions may be provided with a winding sub-portion constructed by simultaneously winding a plurality of strands of the conductor wire, enabling neutral point lead wires and output wires to be led out of a common slot, thereby facilitating connection, and reducing the number of winding steps for the conductor wire when forming the winding portions, thereby shortening the formation process time for the winding portions.
  • At least one of the single-phase winding portions may be constructed by connecting in series winding sub-portions constructed by winding the conductor wire, reducing the diameter of the conductor wire, and suppressing damage to an electrically-insulating coating on the conductor wire resulting from rubbing between the conductor wire and slot opening edge portions during installation of the single-phase winding portions, thereby improving electrical insulation.
  • the number of divided winds of the conductor wire extending outwards from the first and second ends of the slots and divided onto the first and second circumferential sides may be the same in at least one of the single-phase winding portions, forming coil end groups in a well-balanced manner.
  • At least one of the single-phase winding portions may be provided with a plurality of winding sub-portions formed by installing at least one strand of the conductor wire in the stator core, the number of divided winds of the conductor wire extending outwards from the first and second ends of the slots and divided onto the first and second circumferential sides being different in each of the plurality of winding sub-portions, and the total number of divided winds of the conductor wire extending outwards from the first and second ends of the slots and divided onto the first and second circumferential sides being the same on the first and second circumferential sides, forming coil end groups in a well-balanced manner even if there is an odd number of turns.
  • Coil end groups of the stator winding may be constituted by a plurality of crossover portions linking together slot-housed portions of the conductor wire housed in pairs of the slots six slots apart outside end surfaces of the stator core, at least some crossover portions of the plurality of crossover portions being axially offset, enabling a radial dimension of the coil end group to be reduced, thereby ensuring electrical insulation distance between the bracket and the coil end group.
  • Coil end groups of the stator winding may be constituted by a plurality of crossover portions linking together slot-housed portions of the conductor wire housed in pairs of the slots six slots apart outside end surfaces of the stator core, the crossover portions constituting an inner circumferential side of the coil end groups being constructed such that the winds of the conductor wire therein line up axially without overlapping radially, reducing radial expansion of the coil end group, enabling wind noise resulting from circumferential irregularities in the coil end group to be lowered, and increasing the surface area of the winds of the conductor wire constituting the crossover portions on the innermost circumferential side exposed to the cooling airflow, thereby suppressing temperature increases in the stator.
  • a fan may be mounted to an axial end surface of the rotor
  • coil end groups of the stator winding may be constituted by a plurality of crossover portions linking together slot-housed portions of the conductor wire housed in pairs of the slots six slots apart outside end surfaces of the stator core,
  • a fan may be mounted to an axial end surface of the rotor
  • coil end group of the stator winding may be constituted by a plurality of crossover portions linking together slot-housed portions of the conductor wire housed in pairs of the slots six slots apart outside end surfaces of the stator core,
  • a ventilation gap is formed between base portions of the crossover portions and end surfaces of the stator, whereby a cooling airflow flows through the ventilation gap, efficiently cooling the coil end group, thereby suppressing temperature increases in the stator.
  • a central portion of an axial height of the fan and an apex portion of the coil end group may be generally aligned relative to the axial direction, supplying a cooling airflow having the greatest wind speed of any of the cooling airflow discharged from the fan to the apex portion, which has the largest ventilated surface area, efficiently cooling the coil end group, and thereby suppressing temperature increases in the stator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Synchronous Machinery (AREA)
US09/839,396 2000-11-24 2001-04-23 Automotive alternator Expired - Lifetime US6515393B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000357546A JP3484407B2 (ja) 2000-11-24 2000-11-24 車両用交流発電機
JP2000-357546 2000-11-24

Publications (2)

Publication Number Publication Date
US20020063490A1 US20020063490A1 (en) 2002-05-30
US6515393B2 true US6515393B2 (en) 2003-02-04

Family

ID=18829587

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/839,396 Expired - Lifetime US6515393B2 (en) 2000-11-24 2001-04-23 Automotive alternator

Country Status (5)

Country Link
US (1) US6515393B2 (ko)
EP (4) EP1912308B1 (ko)
JP (1) JP3484407B2 (ko)
KR (1) KR100411450B1 (ko)
DE (1) DE60136048D1 (ko)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040119362A1 (en) * 2002-12-19 2004-06-24 Neet Kirk E. Stator winding having cascaded end loops
US20040135440A1 (en) * 2002-12-27 2004-07-15 Mitsubishi Denki Kabushiki Kaisha Stator for a dynamoelectric machine
US20040239203A1 (en) * 2003-05-27 2004-12-02 Joshua Bell Architecture for electric machine
US20050046297A1 (en) * 2002-01-24 2005-03-03 Hanyang Ben Chen Stator winding having transitions
US20050110360A1 (en) * 2003-11-26 2005-05-26 Visteon Global Technologies, Inc. Alternator stator having a multiple filar construction to improve convective cooling
US20050110357A1 (en) * 2003-10-20 2005-05-26 Hiroshi Fukasaku Cable for winding coil and armature
US20080067982A1 (en) * 2006-09-20 2008-03-20 Kevin Allan Dooley Modulation control of power generation system
US20090167225A1 (en) * 2007-12-26 2009-07-02 Dooley Kevin A Motor Drive Architecture with Active Snubber
US20090179530A1 (en) * 2008-01-10 2009-07-16 Remy International, Inc. Stator winding having same radial positions
US20090315427A1 (en) * 2008-06-23 2009-12-24 Jung Moo Seo Slotless motor
US7709980B2 (en) 2003-05-27 2010-05-04 Pratt & Whitney Canada Corp. Architecture for electric machine
US20100164318A1 (en) * 2005-06-30 2010-07-01 Valeo Equipements Electriques Moteur Phase winding for a rotating electrical machine stator and stator equipped with same
US20110210639A1 (en) * 2010-02-26 2011-09-01 Kabushiki Kaisha Toyota Jidoshokki Motor stator and phase coil preform
US20110266912A1 (en) * 2010-04-30 2011-11-03 Alstom Hydro France Rotating electric machine with a stator winding comprising a plurality of coils and method for manufacturing same
US20120007462A1 (en) * 2007-03-05 2012-01-12 Denso Corporation Stator for rotary electric machine and rotary electric machine using same
US20150061434A1 (en) * 2013-09-04 2015-03-05 Denso Corporation Stator for rotating electric machine
US20160241100A1 (en) * 2015-02-18 2016-08-18 Fanuc Corporation Three-phase alternating current motor
US11515743B2 (en) 2018-11-29 2022-11-29 Milwaukee Electric Tool Corporation Motor winding design for an electric motor

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005237068A (ja) * 2004-02-18 2005-09-02 Toyota Motor Corp ステアリングシステム
US20060152100A1 (en) * 2005-01-07 2006-07-13 Visteon Global Technologies, Inc. Vehicle alternator having reduced windings
EP1699126A3 (en) 2005-03-01 2006-10-04 HONDA MOTOR CO., Ltd. Stator, motor and method of manufacturing such stator
JP4584122B2 (ja) 2005-11-22 2010-11-17 本田技研工業株式会社 ステータ
JP4933169B2 (ja) * 2006-06-30 2012-05-16 地方独立行政法人北海道立総合研究機構 コイル部品およびその製造方法
JP4961254B2 (ja) 2006-07-27 2012-06-27 本田技研工業株式会社 蛇行環状巻線コイルの成形機及び蛇行環状巻線コイルの成形方法
DE102007036313A1 (de) * 2007-07-31 2009-02-05 Robert Bosch Gmbh Verfahren zur Herstellung einer Wicklung für den Stator einer elektrischen Maschine
JP2010119241A (ja) * 2008-11-13 2010-05-27 Toyota Motor Corp ステータ、及びコイル
JP5515657B2 (ja) * 2009-11-12 2014-06-11 株式会社デンソー 回転電機の固定子および回転電機
DE102011117247A1 (de) 2011-03-18 2012-09-20 Daimler Ag Stator einer elektrischen Maschine und Verfahren zu dessen Herstellung
DE102011088284A1 (de) * 2011-12-12 2013-06-13 Robert Bosch Gmbh Montagesatz für elektrische Maschinen, elektrische Maschine sowie Verfahren zum Herstellen von elektrischen Maschinen
DE102013226899A1 (de) * 2013-12-20 2015-07-09 Robert Bosch Gmbh Verfahren zum Einbringen einer Wicklung aus mehreren Strängen durch Einziehen in ein rundes Ständereisen mit Nuten
FR3061815B1 (fr) * 2017-01-06 2021-01-01 Valeo Equip Electr Moteur Stator bobine pour machine electrique tournante
JP6608900B2 (ja) 2017-11-17 2019-11-20 ファナック株式会社 回転電機の固定子及び回転電機
EP3876396B1 (en) * 2018-10-30 2024-05-22 Mitsubishi Electric Corporation Stator, electric motor, compressor, air conditioner, and stator manufacturing method
WO2020213028A1 (ja) * 2019-04-15 2020-10-22 三菱電機株式会社 回転電機の固定子
DE102020115248A1 (de) 2020-06-09 2021-12-09 Seg Automotive Germany Gmbh Verfahren zur Herstellung einer Wicklung für einen Rotor einer elektrischen Maschine
CN113595295B (zh) * 2021-08-03 2022-11-08 洪兰兰 一种电机定子

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307311A (en) 1979-05-25 1981-12-22 Robert Bosch Gmbh Winding method for an electrical generator and generator manufactured by the method
JPS57132A (en) 1980-04-30 1982-01-05 Standard Oil Co Injection molding polymer
JPS59159A (ja) 1982-06-24 1984-01-05 Minolta Camera Co Ltd 電子写真感光体
US4857787A (en) 1985-07-15 1989-08-15 Mitsubishi Denki Kabushiki Kaisha Armature of a.c. generator for a car and method of manufacturing the same
US4908541A (en) 1986-08-28 1990-03-13 Mitsuba Electric Mfg., Co., Ltd. Air-cooled layered coil vehicle AC generator stator
US4954734A (en) 1987-05-26 1990-09-04 Mitsubishi Denki Kabushiki Kaisha Three phase alternator with common neutral leads
JPH0426345A (ja) 1990-05-17 1992-01-29 Nippondenso Co Ltd 車両用交流発電機
US5122705A (en) 1990-04-24 1992-06-16 Nippondenso Co., Ltd. Alternating current generator having a plurality of independent three-phase windings

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55141946A (en) * 1979-04-18 1980-11-06 Nippon Denso Co Ltd Stator of generator
JPS57132743A (en) * 1981-02-09 1982-08-17 Nippon Denso Co Ltd Ac generator for vehicle
US4426771A (en) * 1981-10-27 1984-01-24 Emerson Electric Co. Method of fabricating a stator for a multiple-pole dynamoelectric machine
JPS59159638A (ja) * 1983-03-01 1984-09-10 Nippon Denso Co Ltd 車両用交流発電機
JPS60204240A (ja) * 1984-03-26 1985-10-15 Nippon Denso Co Ltd 車両用交流発電機
JP3104239B2 (ja) * 1990-04-24 2000-10-30 株式会社デンソー 回転電機
JPH07222415A (ja) * 1994-02-02 1995-08-18 Mitsubishi Electric Corp 車両用交流発電機
JP3509302B2 (ja) * 1995-06-27 2004-03-22 株式会社デンソー 車両用発電機

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307311A (en) 1979-05-25 1981-12-22 Robert Bosch Gmbh Winding method for an electrical generator and generator manufactured by the method
JPS57132A (en) 1980-04-30 1982-01-05 Standard Oil Co Injection molding polymer
JPS59159A (ja) 1982-06-24 1984-01-05 Minolta Camera Co Ltd 電子写真感光体
US4857787A (en) 1985-07-15 1989-08-15 Mitsubishi Denki Kabushiki Kaisha Armature of a.c. generator for a car and method of manufacturing the same
US4908541A (en) 1986-08-28 1990-03-13 Mitsuba Electric Mfg., Co., Ltd. Air-cooled layered coil vehicle AC generator stator
US4954734A (en) 1987-05-26 1990-09-04 Mitsubishi Denki Kabushiki Kaisha Three phase alternator with common neutral leads
US5122705A (en) 1990-04-24 1992-06-16 Nippondenso Co., Ltd. Alternating current generator having a plurality of independent three-phase windings
JPH0426345A (ja) 1990-05-17 1992-01-29 Nippondenso Co Ltd 車両用交流発電機

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7170211B2 (en) * 2002-01-24 2007-01-30 Visteon Global Technologies, Inc. Stator winding having transitions
US20050046297A1 (en) * 2002-01-24 2005-03-03 Hanyang Ben Chen Stator winding having transitions
US6882077B2 (en) 2002-12-19 2005-04-19 Visteon Global Technologies, Inc. Stator winding having cascaded end loops
US20040119362A1 (en) * 2002-12-19 2004-06-24 Neet Kirk E. Stator winding having cascaded end loops
US6882067B2 (en) * 2002-12-27 2005-04-19 Mitsubishi Denki Kabushiki Kaisha Stator for a dynamoelectric machine
US20040135440A1 (en) * 2002-12-27 2004-07-15 Mitsubishi Denki Kabushiki Kaisha Stator for a dynamoelectric machine
US6936948B2 (en) * 2003-05-27 2005-08-30 Pratt & Whitney Canada Corp. Electric machine having an integrally continuous stator winding and stator slot bridges
US20040239203A1 (en) * 2003-05-27 2004-12-02 Joshua Bell Architecture for electric machine
US20040239202A1 (en) * 2003-05-27 2004-12-02 Dooley Kevin Allan Architecture for electric machine
US6965183B2 (en) * 2003-05-27 2005-11-15 Pratt & Whitney Canada Corp. Architecture for electric machine
US7919894B2 (en) 2003-05-27 2011-04-05 Pratt & Whitney Canada Corp. Architecture for electric machine
US7709980B2 (en) 2003-05-27 2010-05-04 Pratt & Whitney Canada Corp. Architecture for electric machine
US20050110357A1 (en) * 2003-10-20 2005-05-26 Hiroshi Fukasaku Cable for winding coil and armature
US6930426B2 (en) 2003-11-26 2005-08-16 Visteon Global Technologies, Inc. Alternator stator having a multiple filar construction to improve convective cooling
US20050110360A1 (en) * 2003-11-26 2005-05-26 Visteon Global Technologies, Inc. Alternator stator having a multiple filar construction to improve convective cooling
US7868507B2 (en) * 2005-06-30 2011-01-11 Valeo Equipements Electriques Moteur Phase winding for a rotating electrical machine stator and stator equipped with same
US20100164318A1 (en) * 2005-06-30 2010-07-01 Valeo Equipements Electriques Moteur Phase winding for a rotating electrical machine stator and stator equipped with same
US20100072959A1 (en) * 2006-09-20 2010-03-25 Pratt & Whitney Canada Corp. Modulation Control of Power Generation System
US7579812B2 (en) 2006-09-20 2009-08-25 Pratt & Whitney Canada Corp. Modulation control of power generation system
US20090008936A1 (en) * 2006-09-20 2009-01-08 Kevin Allan Dooley Modulation control of power generation system
US7439713B2 (en) 2006-09-20 2008-10-21 Pratt & Whitney Canada Corp. Modulation control of power generation system
US20080067982A1 (en) * 2006-09-20 2008-03-20 Kevin Allan Dooley Modulation control of power generation system
US7944187B2 (en) 2006-09-20 2011-05-17 Pratt & Whitney Canada Corp. Modulation control of power generation system
US8253296B2 (en) * 2007-03-05 2012-08-28 Denso Corporation Stator for rotary electric machine and rotary electric machine using same
US20120007462A1 (en) * 2007-03-05 2012-01-12 Denso Corporation Stator for rotary electric machine and rotary electric machine using same
US8076882B2 (en) 2007-12-26 2011-12-13 Pratt & Whitney Canada Corp. Motor drive architecture with active snubber
US20090167225A1 (en) * 2007-12-26 2009-07-02 Dooley Kevin A Motor Drive Architecture with Active Snubber
US7911105B2 (en) * 2008-01-10 2011-03-22 Remy International, Inc. Stator winding having same radial positions
US20090179530A1 (en) * 2008-01-10 2009-07-16 Remy International, Inc. Stator winding having same radial positions
US7990013B2 (en) * 2008-06-23 2011-08-02 Korea Electronics Technology Institute Slotless motor
US20090315427A1 (en) * 2008-06-23 2009-12-24 Jung Moo Seo Slotless motor
US20110210639A1 (en) * 2010-02-26 2011-09-01 Kabushiki Kaisha Toyota Jidoshokki Motor stator and phase coil preform
US8405274B2 (en) * 2010-02-26 2013-03-26 Kabushiki Kaisha Toyota Jidoshokki Motor stator and phase coil preform
US20110266912A1 (en) * 2010-04-30 2011-11-03 Alstom Hydro France Rotating electric machine with a stator winding comprising a plurality of coils and method for manufacturing same
US20150061434A1 (en) * 2013-09-04 2015-03-05 Denso Corporation Stator for rotating electric machine
US9748811B2 (en) * 2013-09-04 2017-08-29 Denso Corporation Stator for rotating electric machine
US20160241100A1 (en) * 2015-02-18 2016-08-18 Fanuc Corporation Three-phase alternating current motor
US10116179B2 (en) * 2015-02-18 2018-10-30 Fanuc Corporation Three-phase alternating current motor
US11515743B2 (en) 2018-11-29 2022-11-29 Milwaukee Electric Tool Corporation Motor winding design for an electric motor
US12003137B2 (en) 2018-11-29 2024-06-04 Milwaukee Electric Tool Corporation Motor winding design for an electric motor

Also Published As

Publication number Publication date
EP2214291A3 (en) 2010-12-08
EP2214292A3 (en) 2010-12-08
KR20020040536A (ko) 2002-05-30
EP2214291B1 (en) 2015-01-14
EP1211781B1 (en) 2008-10-08
DE60136048D1 (de) 2008-11-20
JP2002165396A (ja) 2002-06-07
EP1912308A3 (en) 2009-11-18
EP1912308A2 (en) 2008-04-16
EP2214292A2 (en) 2010-08-04
EP1912308B1 (en) 2016-01-06
JP3484407B2 (ja) 2004-01-06
EP1211781A1 (en) 2002-06-05
US20020063490A1 (en) 2002-05-30
KR100411450B1 (ko) 2003-12-18
EP2214291A2 (en) 2010-08-04

Similar Documents

Publication Publication Date Title
US6515393B2 (en) Automotive alternator
US6268678B1 (en) Alternator
US6661146B2 (en) Automotive alternator
US6614141B2 (en) Automotive alternator and a method for manufacturing a stator therefor
US6552463B2 (en) Dynamo-electric machine having winding phase groups of series-connected windings connected in parallel
EP1708339B1 (en) Rotary electric machine and stator coil for rotary electric machines
US8686610B2 (en) Automotive dynamoelectric stator
US6946759B2 (en) Stator for an automotive alternator and method of manufacturing the same
US6348750B1 (en) Alternator
US6366000B1 (en) Alternator
US7143506B2 (en) Rotary electric machine and method for manufacturing the same
US6690099B2 (en) Automotive alternator
US6717317B2 (en) Stator for a dynamoelectric machine
JP2013192360A (ja) 回転電機及びその生産方法
US6373166B1 (en) Alternator
JP3476438B2 (ja) 車両用交流発電機
EP1109295B1 (en) Winding heads for the stator of an alternator
EP1109294B1 (en) Alternator
JP3644919B2 (ja) 交流発電機

Legal Events

Date Code Title Description
AS Assignment

Owner name: MITSUBISHI DENKI KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ASAO, YOSHIHITO;OOHASHI, ATSUSHI;ADACHI, KATSUMI;REEL/FRAME:011729/0080

Effective date: 20010327

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12